List of top Questions asked in JEE Main

In the following compounds, the decreasing order of basic strength will be :

Coupling of benzene diazonium chloride with 1 - naphthol in alkaline medium will give :

The major product of the following reaction is :

For the reaction \(2\mathrm{A} + \mathrm{B} \to \mathrm{C}\), the values of initial rate at diffrent reactant concentrations are given in the table below. The rate law for the reaction is :

[A] (mol L-1)	[B] (mol L-1)	Initial Rate (mol L-1 s-1)
0.05	0.05	0.045
0.10	0.05	0.090
0.20	0.10	0.72

Given that
\(E^{\ominus}_{\mathrm{O_2/H_2O}} = 1.23\ \mathrm{V}\);
\(E^{\ominus}_{\mathrm{S_2O_8^{2-}/SO_4^{2-}}} = 2.05\ \mathrm{V}\)
\(E^{\ominus}_{\mathrm{Br_2/Br^-}} = 1.09\ \mathrm{V}\)
\(E^{\ominus}_{\mathrm{Au^{3+}/Au}} = 1.4\ \mathrm{V}\)
The strongest oxidizing agent is :

The major product of the following reaction is :

Which of the following amines can be prepared by Gabriel phthalimide reaction ?

An organic compound neither reacts with neutral ferric chloride solution nor with fehling solution. it however, reacts with Grignard reagent and gives positive iodoform test. The compound is :

The major product of the following reaction is :

If solublity product of \(\mathrm{Zr_3(PO_4)_4}\) is denoted by \(\mathrm{K_{sp}}\) and its molar solubility is denoted by S, then which of the following relation between S and \(\mathrm{K_{sp}}\) is correct ?

Maltose on treatment with dilute HCI gives :

The following ligand is :

In SI units, the dimensions of \(\sqrt{\dfrac{\in_0}{\mu_0}}\) is :

A particle moves in one dimension from rest under the influence of a force that varies with the distance travelled by the particle as shown in the figure. The kinetic energy of the particle after it has travelled 3m is :

The wavelength of the carrier waves in a modern optical fiber communication network is close to :

For the circuit shown, with R₁ = 1.0W, R₂ = 2.0 W, E₁ = 2 V and E₂ = E₃ = 4 V, the potential difference between the points 'a' and 'b' is approximately (in V):

A 200 \(\Omega\) resistor has a certain color code. If one replaces the red color by green in the code, the new resistance will be :

Radiation coming from transitions \(n = 2\) to \(n = 1\) of hydrogen atoms fall on \(\mathrm{He^+}\) ions in \(n = 1\) and \(n = 2\) states. The possible transition of helium ions as they absorb energy from the radiation is :

In figure, the optical fiber is \(l\) = 2m long and has a diameter of d = 20 \(\mu\)m. If a ray of light is incident on one end of the fiber at angle \(\theta_1\) = 40°, the number of reflection it makes before emerging from the other end is close to: (refractive index of fibre is 1.31 and sin 40° = 0.64)

An upright object is placed at a distance of 40 cm in front of a convergent lens of focal length 20 cm. A convergent mirror of focal length 10 cm is placed at a distance of 60 cm on the other side of the lens. The position and size of the final image will be :

Ship A is sailing towards north-east with velocity \(\vec{v} = 30\hat{i} + 50\hat{j}\) km/hr where \(\hat{i}\) points east and \(\hat{j}\), north. Ship B is at a distance of 80 km east and 150 km north of Ship A and is sailing towards west at 10 km/hr. A will be at minimum distance from B in :

Water from a pipe is coming at a rate of 100 litres per minute. If the radius of the pipe is 5 cm, the Reynolds number for the flow is of the order of : (density of water = 1000 kg/m³, coefficient of viscosity of water = 1mPas)

The reverse breakdown voltage of a Zener diode is 5.6 V in the given circuit.

The current \(I_Z\) through the Zener is :

A wire of length \(2L\), is made by joining two wires A and B of same length but different radii \(r\) and \(2r\) and made of the same material. It is vibrating at a frequency such that the joint of the two wires forms a node. If the number of antinodes in wire A is \(p\) and that in B is \(q\) then the ratio \(p : q\) is :

Two particles move at right angle to each other. Their de-Broglie wavelengths are \(\lambda_1\) and \(\lambda_2\) respectively. The particles suffer perfectly inelastic collision. The de-Broglie wavelength \(\lambda_2\) of the final particle, is given by :